mmc: host: add pad and tlmm configuration

This patch adds the pad and tlmm configuration to msm-sdhci
driver.

Change-Id: Ic2b9beffdb555598bdc15b4b03c8adb78fbd0c2c
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>

Documentation/devicetree/bindings/mmc/sdhci-msm.txt

@@ -44,10 +44,18 @@ In the following, <supply> can be vdd (flash core voltage) or vdd-io (I/O voltag
 	- gpios - specifies gpios assigned for sdhc slot.
 	- qcom,gpio-names -  a list of strings that map in order to the list of gpios
 
+	A slot has either gpios or dedicated tlmm pins as represented below.
+	- qcom,pad-pull-on - Active pull configuration for sdc tlmm pins
+	- qcom,pad-pull-off - Suspend pull configuration for sdc tlmm pins.
+	- qcom,pad-drv-on - Active drive strength configuration for sdc tlmm pins.
+	- qcom,pad-drv-off - Suspend drive strength configuration for sdc tlmm pins.
+	Tlmm pins are specified as <clk cmd data>
+
 Example:
 
 	aliases {
 		sdhc1 = &sdhc_1;
+		sdhc2 = &sdhc_2;
 	};
 
 	sdhc_1: qcom,sdhc@f9824900 {
@@ -79,3 +87,21 @@ Example:
 			<&msmgpio 35 0>; /* DATA3 */
 		qcom,gpio-names = "CLK", "CMD", "DAT0", "DAT1", "DAT2", "DAT3";
 	};
+
+	sdhc_2: qcom,sdhc@f98a4900 {
+		compatible = "qcom,sdhci-msm";
+                reg = <0xf9824900 0x11c>, <0xf9824000 0x800>;
+                reg-names = "hc_mem", "core_mem";
+                interrupts = <0 123 0>, <0 138 0>;
+                interrupt-names = "hc_irq", "pwr_irq";
+
+		vdd-supply = <&pm8941_l21>;
+		vdd-io-supply = <&pm8941_l13>;
+
+                qcom,bus-width = <4>;
+
+		qcom,pad-pull-on = <0x0 0x3 0x3>; /* no-pull, pull-up, pull-up */
+		qcom,pad-pull-off = <0x0 0x3 0x3>; /* no-pull, pull-up, pull-up */
+		qcom,pad-drv-on = <0x7 0x4 0x4>; /* 16mA, 10mA, 10mA */
+		qcom,pad-drv-off = <0x0 0x0 0x0>; /* 2mA, 2mA, 2mA */
+	};

drivers/mmc/host/sdhci-msm.c

@@ -96,13 +96,43 @@ struct sdhci_msm_gpio_data {
 	u8 size;
 };
 
+struct sdhci_msm_pad_pull {
+	enum msm_tlmm_pull_tgt no;
+	u32 val;
+};
+
+struct sdhci_msm_pad_pull_data {
+	struct sdhci_msm_pad_pull *on;
+	struct sdhci_msm_pad_pull *off;
+	u8 size;
+};
+
+struct sdhci_msm_pad_drv {
+	enum msm_tlmm_hdrive_tgt no;
+	u32 val;
+};
+
+struct sdhci_msm_pad_drv_data {
+	struct sdhci_msm_pad_drv *on;
+	struct sdhci_msm_pad_drv *off;
+	u8 size;
+};
+
+struct sdhci_msm_pad_data {
+	struct sdhci_msm_pad_pull_data *pull;
+	struct sdhci_msm_pad_drv_data *drv;
+};
+
+
 struct sdhci_msm_pin_data {
 	/*
 	 * = 1 if controller pins are using gpios
 	 * = 0 if controller has dedicated MSM pads
 	 */
+	u8 is_gpio;
 	bool cfg_sts;
 	struct sdhci_msm_gpio_data *gpio_data;
+	struct sdhci_msm_pad_data *pad_data;
 };
 
 struct sdhci_msm_pltfm_data {
@@ -180,20 +210,88 @@ free_gpios:
 	return ret;
 }
 
+static int sdhci_msm_setup_pad(struct sdhci_msm_pltfm_data *pdata, bool enable)
+{
+	struct sdhci_msm_pad_data *curr;
+	int i;
+
+	curr = pdata->pin_data->pad_data;
+	for (i = 0; i < curr->drv->size; i++) {
+		if (enable)
+			msm_tlmm_set_hdrive(curr->drv->on[i].no,
+				curr->drv->on[i].val);
+		else
+			msm_tlmm_set_hdrive(curr->drv->off[i].no,
+				curr->drv->off[i].val);
+	}
+
+	for (i = 0; i < curr->pull->size; i++) {
+		if (enable)
+			msm_tlmm_set_pull(curr->pull->on[i].no,
+				curr->pull->on[i].val);
+		else
+			msm_tlmm_set_pull(curr->pull->off[i].no,
+				curr->pull->off[i].val);
+	}
+
+	return 0;
+}
+
 static int sdhci_msm_setup_pins(struct sdhci_msm_pltfm_data *pdata, bool enable)
 {
 	int ret = 0;
 
 	if (!pdata->pin_data || (pdata->pin_data->cfg_sts == enable))
 		return 0;
-
+	if (pdata->pin_data->is_gpio)
 		ret = sdhci_msm_setup_gpio(pdata, enable);
+	else
+		ret = sdhci_msm_setup_pad(pdata, enable);
+
 	if (!ret)
 		pdata->pin_data->cfg_sts = enable;
 
 	return ret;
 }
 
+static int sdhci_msm_dt_get_array(struct device *dev, const char *prop_name,
+				 u32 **out, int *len, u32 size)
+{
+	int ret = 0;
+	struct device_node *np = dev->of_node;
+	size_t sz;
+	u32 *arr = NULL;
+
+	if (!of_get_property(np, prop_name, len)) {
+		ret = -EINVAL;
+		goto out;
+	}
+	sz = *len = *len / sizeof(*arr);
+	if (sz <= 0 || (size > 0 && (sz != size))) {
+		dev_err(dev, "%s invalid size\n", prop_name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	arr = devm_kzalloc(dev, sz * sizeof(*arr), GFP_KERNEL);
+	if (!arr) {
+		dev_err(dev, "%s failed allocating memory\n", prop_name);
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = of_property_read_u32_array(np, prop_name, arr, sz);
+	if (ret < 0) {
+		dev_err(dev, "%s failed reading array %d\n", prop_name, ret);
+		goto out;
+	}
+	*out = arr;
+out:
+	if (ret)
+		*len = 0;
+	return ret;
+}
+
 #define MAX_PROP_SIZE 32
 static int sdhci_msm_dt_parse_vreg_info(struct device *dev,
 		struct sdhci_msm_reg_data **vreg_data, const char *vreg_name)
@@ -261,11 +359,164 @@ static int sdhci_msm_dt_parse_vreg_info(struct device *dev,
 	return ret;
 }
 
+/* GPIO/Pad data extraction */
+static int sdhci_msm_dt_get_pad_pull_info(struct device *dev, int id,
+		struct sdhci_msm_pad_pull_data **pad_pull_data)
+{
+	int ret = 0, base = 0, len, i;
+	u32 *tmp;
+	struct sdhci_msm_pad_pull_data *pull_data;
+	struct sdhci_msm_pad_pull *pull;
+
+	switch (id) {
+	case 1:
+		base = TLMM_PULL_SDC1_CLK;
+		break;
+	case 2:
+		base = TLMM_PULL_SDC2_CLK;
+		break;
+	case 3:
+		base = TLMM_PULL_SDC3_CLK;
+		break;
+	case 4:
+		base = TLMM_PULL_SDC4_CLK;
+		break;
+	default:
+		dev_err(dev, "%s: Invalid slot id\n", __func__);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	pull_data = devm_kzalloc(dev, sizeof(struct sdhci_msm_pad_pull_data),
+			GFP_KERNEL);
+	if (!pull_data) {
+		dev_err(dev, "No memory for msm_mmc_pad_pull_data\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+	pull_data->size = 3; /* array size for clk, cmd, data */
+
+	/* Allocate on, off configs for clk, cmd, data */
+	pull = devm_kzalloc(dev, 2 * pull_data->size *\
+			sizeof(struct sdhci_msm_pad_pull), GFP_KERNEL);
+	if (!pull) {
+		dev_err(dev, "No memory for msm_mmc_pad_pull\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+	pull_data->on = pull;
+	pull_data->off = pull + pull_data->size;
+
+	ret = sdhci_msm_dt_get_array(dev, "qcom,pad-pull-on",
+			&tmp, &len, pull_data->size);
+	if (ret)
+		goto out;
+
+	for (i = 0; i < len; i++) {
+		pull_data->on[i].no = base + i;
+		pull_data->on[i].val = tmp[i];
+		dev_dbg(dev, "%s: val[%d]=0x%x\n", __func__,
+				i, pull_data->on[i].val);
+	}
+
+	ret = sdhci_msm_dt_get_array(dev, "qcom,pad-pull-off",
+			&tmp, &len, pull_data->size);
+	if (ret)
+		goto out;
+
+	for (i = 0; i < len; i++) {
+		pull_data->off[i].no = base + i;
+		pull_data->off[i].val = tmp[i];
+		dev_dbg(dev, "%s: val[%d]=0x%x\n", __func__,
+				i, pull_data->off[i].val);
+	}
+
+	*pad_pull_data = pull_data;
+out:
+	return ret;
+}
+
+static int sdhci_msm_dt_get_pad_drv_info(struct device *dev, int id,
+		struct sdhci_msm_pad_drv_data **pad_drv_data)
+{
+	int ret = 0, base = 0, len, i;
+	u32 *tmp;
+	struct sdhci_msm_pad_drv_data *drv_data;
+	struct sdhci_msm_pad_drv *drv;
+
+	switch (id) {
+	case 1:
+		base = TLMM_HDRV_SDC1_CLK;
+		break;
+	case 2:
+		base = TLMM_HDRV_SDC2_CLK;
+		break;
+	case 3:
+		base = TLMM_HDRV_SDC3_CLK;
+		break;
+	case 4:
+		base = TLMM_HDRV_SDC4_CLK;
+		break;
+	default:
+		dev_err(dev, "%s: Invalid slot id\n", __func__);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	drv_data = devm_kzalloc(dev, sizeof(struct sdhci_msm_pad_drv_data),
+			GFP_KERNEL);
+	if (!drv_data) {
+		dev_err(dev, "No memory for msm_mmc_pad_drv_data\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+	drv_data->size = 3; /* array size for clk, cmd, data */
+
+	/* Allocate on, off configs for clk, cmd, data */
+	drv = devm_kzalloc(dev, 2 * drv_data->size *\
+			sizeof(struct sdhci_msm_pad_drv), GFP_KERNEL);
+	if (!drv) {
+		dev_err(dev, "No memory msm_mmc_pad_drv\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+	drv_data->on = drv;
+	drv_data->off = drv + drv_data->size;
+
+	ret = sdhci_msm_dt_get_array(dev, "qcom,pad-drv-on",
+			&tmp, &len, drv_data->size);
+	if (ret)
+		goto out;
+
+	for (i = 0; i < len; i++) {
+		drv_data->on[i].no = base + i;
+		drv_data->on[i].val = tmp[i];
+		dev_dbg(dev, "%s: val[%d]=0x%x\n", __func__,
+				i, drv_data->on[i].val);
+	}
+
+	ret = sdhci_msm_dt_get_array(dev, "qcom,pad-drv-off",
+			&tmp, &len, drv_data->size);
+	if (ret)
+		goto out;
+
+	for (i = 0; i < len; i++) {
+		drv_data->off[i].no = base + i;
+		drv_data->off[i].val = tmp[i];
+		dev_dbg(dev, "%s: val[%d]=0x%x\n", __func__,
+				i, drv_data->off[i].val);
+	}
+
+	*pad_drv_data = drv_data;
+out:
+	return ret;
+}
+
 #define GPIO_NAME_MAX_LEN 32
 static int sdhci_msm_dt_parse_gpio_info(struct device *dev,
 		struct sdhci_msm_pltfm_data *pdata)
 {
-	int ret = 0, cnt, i;
+	int ret = 0, id = 0, cnt, i;
 	struct sdhci_msm_pin_data *pin_data;
 	struct device_node *np = dev->of_node;
 
@@ -278,6 +529,7 @@ static int sdhci_msm_dt_parse_gpio_info(struct device *dev,
 
 	cnt = of_gpio_count(np);
 	if (cnt > 0) {
+		pin_data->is_gpio = true;
 		pin_data->gpio_data = devm_kzalloc(dev,
 				sizeof(struct sdhci_msm_gpio_data), GFP_KERNEL);
 		if (!pin_data->gpio_data) {
@@ -294,7 +546,6 @@ static int sdhci_msm_dt_parse_gpio_info(struct device *dev,
 			ret = -ENOMEM;
 			goto out;
 		}
-
 		for (i = 0; i < cnt; i++) {
 			const char *name = NULL;
 			char result[GPIO_NAME_MAX_LEN];
@@ -308,10 +559,37 @@ static int sdhci_msm_dt_parse_gpio_info(struct device *dev,
 			dev_dbg(dev, "%s: gpio[%s] = %d\n", __func__,
 				pin_data->gpio_data->gpio[i].name,
 				pin_data->gpio_data->gpio[i].no);
-			pdata->pin_data = pin_data;
 		}
+	} else {
+		pin_data->pad_data =
+			devm_kzalloc(dev,
+				     sizeof(struct sdhci_msm_pad_data),
+				     GFP_KERNEL);
+		if (!pin_data->pad_data) {
+			dev_err(dev,
+				"No memory for pin_data->pad_data\n");
+			ret = -ENOMEM;
+			goto out;
 		}
 
+		ret = of_alias_get_id(np, "sdhc");
+		if (ret < 0) {
+			dev_err(dev, "Failed to get slot index %d\n", ret);
+			goto out;
+		}
+		id = ret;
+
+		ret = sdhci_msm_dt_get_pad_pull_info(
+			dev, id, &pin_data->pad_data->pull);
+		if (ret)
+			goto out;
+		ret = sdhci_msm_dt_get_pad_drv_info(
+			dev, id, &pin_data->pad_data->drv);
+		if (ret)
+			goto out;
+
+	}
+	pdata->pin_data = pin_data;
 out:
 	if (ret)
 		dev_err(dev, "%s failed with err %d\n", __func__, ret);
@@ -960,7 +1238,7 @@ static int sdhci_msm_remove(struct platform_device *pdev)
 	if (!IS_ERR_OR_NULL(msm_host->bus_clk))
 		clk_disable_unprepare(msm_host->bus_clk);
 	if (pdata->pin_data)
-		sdhci_msm_setup_gpio(pdata, false);
+		sdhci_msm_setup_pins(pdata, false);
 	return 0;
 }